Apply suggestions from code review

Co-Authored-By: Jeff Rafter <jeffrafter@github.com>

Author: stephaniegiang

app/controllers/orgs/rosters_controller.rb

@@ -137,14 +137,12 @@ def edit_entry
 
     # rubocop:disable Metrics/AbcSize
     def add_students
-      # channel = AddStudentsToRosterChannel.channel(roster_id: current_roster.id, user_id: current_user.id)
       params[:lms_user_ids].split! if params[:lms_user_ids].is_a? String
       lms_user_ids = Array.wrap(params[:lms_user_ids])
 
       identifiers = params[:identifiers].split("\r\n").reject(&:blank?)
       job_info = AddStudentsToRosterJob.perform_later(identifiers, current_roster, current_user, lms_user_ids)
       render json: { job_info: job_info }
-      # redirect_to roster_path(current_organization, anchor: "new-student-modal")
     end
     # rubocop:enable Metrics/AbcSize
 

app/jobs/add_students_to_roster_job.rb

@@ -14,7 +14,6 @@ class AddStudentsToRosterJob < ApplicationJob
   # rubocop:disable MethodLength
   def perform(identifiers, roster, user, lms_user_ids = [])
     channel = AddStudentsToRosterChannel.channel(roster_id: roster.id, user_id: user.id)
-    # ActionCable.server.broadcast(channel, status: "update_started")
 
     identifiers = add_suffix_to_duplicates!(identifiers, roster)
     invalid_roster_entries =